Cooling installation



March 12, 1940. H. E. scH uLsE COOLING INSTALLATION Original Filed July1a, 1956 3 Sheets-Sheet 1 INVENTOR. Herman E. Sclzaise BY v QWwM-widxzamm ATTORNEYS.

March 12, 1940. SCHULSE 2,193,540

COOLING INSTALLATION I Original Filed July 18, 1936 3 Sheets-Sheet 2[111. 5 INVENTOR. 7g HermanESchulse 2 09W? WMA v A TTORN E YS.

March 12, 1940.

H. SCHULSE coomne INSTALLATION Original Filed July 18 1936 3Sheets-Sheet 3 INVENTOR. Herman E.Schulse A TTORNEYS.

Patented Mar. 12, 1940 UNITED STATES} PATENT OFFICE 2.19am coormorINSTALLATION Herman E. Schulse, Miami, Fla.

Application July 18, 1936, Serial No. 91,334

Renewed April 2, 1938 18 Claims. (0]. 62-141) My present inventionrelates to installations and equipment for circulating and controllingthe operation of cooling fluid, and has particular application to a brewconditioning systemin which the brew is cooled in the original keg orbarrel.

While the invention is applicable in other relations, it is particularlyuseful in connection with the installation and the performance of themethod claimed in my copending application, Serial No. 759,440, filedDecember 28, 1934, issued as Patent No. 2,051,013 on August 11, 1936.

The equipment and apparatus for controlling the circulation and coolingof the present invention constitutes an improvement upon that disclosedin my prior application above identified and the present application isa continuation in part of said prior application.

Among the objects of the invention are to provide a circulating andcontrolling installation that may be readily set up as a fixture in thetap room, which is of compact and rugged construction which is made uplargely of standard units of familiar construction and proved eflicacyincluding such standard elements as a compressor unit and expansionvalve, thermostatically controlled valves and switches, and whichoperates reliably, economically and automatically to maintain thecooling fluid within the desired close limits of cooling effectivenessand in the particular application in which water is used as the coolingfluid, maintains the same between the desired close temperature limits,preferably, very slightly above the freezing point, and whichisadaptable in small establishments with but a few kegs on the coolingline as well as for larger establishments with a considerably greaternumber of containers to be cooled and kept cool simultaneously.

Another object is to provide an installation of the above type in whichderangement in the cooling system is automatically indicated and can notresult in impairing the palatable condition of the brew in thecontainers, which brew may continue to be served therefrom in propercondition for a considerable period of time pending repair.

Another object is to provide an installation of the character set forthby which the circulation of the cooling fluid may be interrupted atwill,

as for instance, when an empty barrel is to be disconnected and replacedby a full one, without substantial loss or leak of the cooling mediumand by which substantial assurance is had that the circulation of suchcooling medium is resumed after the fresh keg has been connected to theline.

tained and are readily accessible for inspection and service.

A feature of the invention is the installation comprising the coolingbox and the headers extending therefrom, preferably horizontally along awall of the tap room, through which the cooling fluid is circulated andfrom which the cooling fluid is pumped into heat conductive relationwith the contents of the various brew kegs, desirably by releasablyconnecting the latter in parallel thereacross.

Another feature is the thermostatic control by 20 which the circuit tothe electric motor which drives the pump that circulates the coolingmedium, usually cold water, through the barrels or kegs, is interruptedeither manually as for instance when a keg is to be replaced, orautomatically as for instance, when the compressor should becomederanged and the cooling water reach the uppermost permissible limit oftemperature or when an excessive load is placed on said motor.

Another feature is the automatic control de- 80 sirably a temperaturecontrol, for interrupting the circuit of the compressor motor wheneverthe primary refrigerating medium reaches the lower limit of permissibletemperature.

Another feature is the construction of the re- 35 frigerating unit witha heat insulated tank containing the refrigerating coil, with thevarious control apparatus in a narrow instrument compartment accessiblefrom the front, with the a somewhat larger scale taken on line 4-4 ofFig. 3,

Fig. 5 is a plan view of the box shown in Fig. 4 with part of the coverremoved,

Fig. 6 is a front elevation of the refrigerating box with the frontpanel and other parts removed to show the relation of certain of theelements thereof,

Fig. 7 is a detail sectional view on a larger scale taken on line '|-'Iof Fig. 5,

Fig. 8 is a circuit diagram showing the approximate relation of thevarious electrical control elements with respect to the outline of thebox or cabinet,-and Fig. 9 is a sectional view of a bypass plugconnection detail.

While the invention herein claimed may be used in other relations, it isdisclosed in Figs. 1 and 2 as it is applied in the brew coolinginstallation and method of my prior application above identified.

That installation in its general broad outlines includes a series ofstandard size transportation beer barrels, kegs or containers, of woodor metal, each having means associated therewith for cooling andmaintaining at substantially dispensing temperature the beer oi otherbrew contained therein.

For this purpose, coolingfiuid, preferably water, is supplied from asource shown as the cabinet or box C adjacent the barrels through a pipemain 2!! and returned through a pipe main 2|. Both mains are enclosed ina common heat insulating jacket 22 extending the length of theinstallation and having a portion 23 on the cabinet C. Branches 24' and24 of rubber, preferably jacketed with sponge rubber, tap the respectivemains and are connected to the several beer barrels B, B B etc. tocirculate the water in parallel into heat exchange relation with theenclosed brew, as for instance, through coils 25. The cabinet or box Chas an overflow pipe I30 therein which determines the level of water insaid tank and that level is shown as below that of the branch endsthrough which water is fed to the several containers.

The cooling water is pumped through the mains 20 and 2| and through theconduits of the various barrels in parallel, by a circulating system,both the propulsion and temperature of the water in which areautomatically controlled from the cabinet C, to maintain the beer withineach of the barrels at all times at substantially the correct dispensingtemperature.

Accordingly, any of the barrels can be tapped directly to dispense beerto the consumer without further chilling outside of the barrel. For thispurpose, as shown roughly in Fig. 1, the barrels B and B are showntapped, each tap rod 25 having a faucet F at the upper end thereof andhaving gas pressure applied therethrough at 28 from gas conduit 29. Theremaining barrels B etc. on the line are shown cooled, but in reserveuntil required to be tapped. A semi-circular drain pan 1) is preferablylaid on each barrel on tap directly under the faucet spout.

The equipment constituting the cooling and control system which exceptfor the conventional compressor and condenser unit U as showncontained'in the cabinet or box C, is shown in Figs. 3 130 7 inclusive.Said cabinet C includes a tank 30 for the cooling water in which adouble helical refrigerating coil 3i is immersed.

The tank is heat insulated, desirably by resting it upon a slab 33 ofpressed insulating cork upon sheet metal floor 34 of the box, andsimilar slabs of pressed insulating cork 35 fill the space between theside walls of the tank 30 and corresponding side walls or partitions 36of the box.

Near the bottom of the tank is the water circulating pump 31, preferablyof the centrifugal type, which has an axial inlet 38 communicatingdirectly with the water in the tank and an outlet 39 rising therefromand connected by means of a flexible hose 40 to the supply main 20, fromwhich the circulating water re-enters the tank by way of return main 2|,which discharges into the top of the tank 30, at a level below the headsof the respective barrels. Preferably the connection between the waterheaders 20 and 2| of the tank is through a header elbow 44, removablyattached to the top of the box and which may be altematively placedeither or both at the right or left end of the cover depending onwhether the headers are to extend from one or the other side of thecabinet.

The pump 31 is driven by an electric motor 46 preferably disposed underthe floor of the cabinet which has legs 41. The motor is attached undersaid floor by means of any suitable bracket 48 used for ceiling mountingand is desirably rubber mounted to absorb vibration. Preferably thismount is of the familiar pivot character automatically to tighten thebelt 49, by which torque is transmitted to the pump 31. The belt extendsin front of the front wall or partition 36 of the box around the pumppulley 5|. As shown in the detail of Fig. '7, the pump bearing 52 restsin a liner 53 in the front wall of the box and is secured in place by anut 55 upon its extremity, drawing the shoulder 45 thereon to compress agasket 56 against the inner end thereof. The pump shaft 51 through saidbearing and which mounts the pulley 5| is connected in leak-tightrelation by means of a gland 58 thereabout. The various control elementsare preferably located in the control compartment 59 in front of thewall 36 to which compartment access is readily had through door 60 infront.

The electric motor is operated continuously while the system is inservice and as long as the water in the tank 30 is kept within the rangeof temperature permissible for cooling the brew. A control is, however,provided for automatically arresting the circulation of cooling waterpreferably by disconnecting the circuit of motor 46,

should the refrigerating system become derangedand the temperature ofthe cooling tank rise above the permissible maximum. At the same time anormally inactive signal apprises the operator of the defect. Adesirable apparatus for this purpose comprises a thermostaticallyoperated switch 6| in the control compartment, illustratively near thetop thereof, which is operated from a thermostatic bulb 62 in the watertank. the stem of said bulb extending therefrom through bushing 63 inthe front wall. As this switch is conventional, its details, need not beset forth. It is sufficient to state that by expansion of the fluid inthe bulb, the switch is opened and upon subsequent contraction when thewater again is sufficiently cold, the switch again closes circuit, sothat the motor resumes operation. The bulb 62 is submerged in the water,so as to respond to its temperature. By this means the system iscontrolled, so that at no time will it pump water of temperature morethan a predetermined maximum, preferably not greater than 10 degrees F.higher than the optimum temperature, which desirably is kept as close tothe freezing point as possible.

The switch BI is preferably of a combination variety familiar to thoseskilled in the art, to respond not only to temperature, as noted, butalso to open on overload and at will by manipulation. The manualoperation is for the purpose of disconnecting the circulation of wateras for instance, when an empty keg or barrel is to. be replaced. Anelectric signal desirably, a lamp 66 in the control cabinet and behind awindow or bulls eye 61 in the door, apprises the attendant of the factthat the motor is not running, regardless whether this be due tothermostatic action, overload, or manual opening of switch 6!. Uponresetting the switch 6| through button 68, operation resumes after amanual or temporary overload disconnection, but the button isinoperative to close circuit until the expansion fluid in thethermostatic bulb has contracted after cooling to within the desiredrange.

In Fig. 8 is shown the circuit diagram, indicating the inter-relationbetween the combination thermostatic, overload and manual switch 6|, themotor 46 and the signal lamp 66. It is seen that the motor circuit fromthe mains m and m is closed through switch 6|, when the latter isclosed, and that the terminals of the lamp 66 are short-circuited bysaid switch at common terminals 69 and 10 on the terminal block 1|.-

When the switch 6| is open, the signal lamp is energized from the mainsby connection in series with the motor. As soon as the switch 6|recloses, whether by operation of the thermostat or by hand, the motor46 resumes operation and the signal lamp goes out. It is, of course,understood that the signal may be a thermostatic flasher lamp, bell,buzzer or other indicator. The

brew in the barrels as well as the water in the pipes being atsubstantially dispensing temperature when the trouble signal registers,the attendant might despite the interruption of cooling circulation,continue serving brew in substantially perfect condition for asubstantial period of time pending repair.

A desirable refrigeration cycle for keeping the cooling water in tank 36at proper temperature involves a conventional compressor unit ordinarilydisposed below the dispensing establishment, said unit including areciprocating compressor 12 driven by belt 49' from an electric motor46', said compressor feeding the refrigerant through a contiguouscondenser coil 13, where the heat is removed by radiation. Therefrigerant passes from the condenser 13 to receiver l9 thence through asmall pipe 14 to the inlet of an expansion valve 16 and from the outlet11 thereof to the refrigerating coil 3| in the cooling water tank 3|].The return from the refrigerating coil 3| flows through the pipe 18 oflarger diameter than inlet pipe 14 back to the compressor, in which thevapor is restored to the liquid condition and cooled in condenser I3,for repetition of the refrigerating cycle set forth.

The fiow of the refrigerant in the expansion coil is thermostaticallymodulated by means comprising a conventional thermostatic bulb 86 isheld by clamp near the outlet of the refrig-v The expansion valve 16used is a familiar piece of apparatus which when warm water is in thetank, as when it is initially set up for operation, operatessubstantially as a pressure relief .valve to permit effective andrelatively rapid cooling. But when the water-approaches the temperaturerange for which the expansion valve is designed or adjusted, thepressure relief operation is modulated by the thermostatic action whichthen sets in. The circuit to the compressor motor 46', is interruptedwhen the temperature water in the tank falls too low, by a temperaturecontrol switch 82 in the control cabinet 59. Temperature controlledswitch 82 is operated from a thermostatic bulb 83, clamped to therefrigerating coil. Upon opening of switch 82, the refrigerating cycleis interrupted and as the water becomes warmer than desired, thethermostatic fluid in bulb 83 again expands to cause switch 82 toreclose and motor 46' to resume operation. The fluid in bulb 80 also nowexpands to cause expansion valve 16 to reopen and permit refrigerationto resume.

As shown in the drawings, the various electrical control and auxiliaryelements including the combination thermostatic, manual and overloadswitch 6l, the temperature control switch 82, the signal lamp 66, theterminal block H and the various electrical connecting conduits Ctherefor are located in the narrow instrument compartment 59, while theelectric motor 46, of length greater than the depth of said compartmentis disposed therebehind. v

The expansion valve is preferably mounted as shown, on the insulatingcover ledge 84 of the compartment and is enclosed by sheet metal hood85, the main insulating cover 81 in front of the hood being a separateelement to afford ready access to the coil, while the expansion valveand connections thereto from the compressor are readily accessible byremoval of the hood 85. The

coil and the expansion valve with their associated cover ledge 84 mayreadily be removed from the assembly as a single unit withoutinterrupting the connection therebetween.

Preferably the tank is equipped with means to limit the level to whichit can be filled with water. For this purpose, a nipple connection 86protrudes through the floor of the box from the interior of the tank 30.To this nipple is connected a rubber hose which is releasably connectedat its upper end to a clamp9| preferably in back of the tank or box, atthe limiting level above which the water in the tank cannot rise, sinceit will overflow through the hose.

The upper end of the hose may be disconnected and its loose end loweredto permit draining the tank when desired.

Preferably the upper surface of the cover 81 is made of rust proof andstainless material to serve as a cutting board.

Switch 6| being thrown open preparatory to removing a barrel from theline, as for instance, for replacement, no cooling water is lost bypumping through the now open connections. By the release of the partsabove described, substantially no water is lost from the system bygravity flow, since the return pipe 2| and the feed hose 40 of the tank30 'both extend con siderably below the barrel heads, as does also thelevel of the water in tank 30. Accordingly, a siphoning action isexerted upon the now open pipe branch ends which are readily connectedto the fresh barrel. It is preferable before connecting such freshbarrel in the cooling circuit to pour water over its head, which willfill the coolingcoil 65 thereof to compensate for the water remaining inthe cooling pipe 25 of the empty barrel that was removed.

No air blocking occurs in the circulating system during replacement orat any other time, since a high resistance connection 92 between thesupply and return mains and 2| obviates dead air pockets in thecirculating system and thus assures air clearance.

If it is desired to operate the installation with less than the fullnumber of kegs for which it has outlets, this can readily be done byconnecting the inlet and outlet branch hoses that are not connected to abarrel, preferably through a high resistance fitting 88 (Fig. 9) havinga restricted longitudinal passage 89 and tapped ends 89' to which theends of the branch hose may be connected-by suitable union fittings.

The fitting 88 affords a resistance to flow, preferably of the order ofthat of the cooling coil of a barrel, so as not to short-circuit thecooling conduit of other barrels or kegs on the line. Instead of thefitting 88, a double ended imperforate plug of Bakelite, vulcanite orthe like might be used to shut off the passage between the two hosebranches across the mains.

The use of water as the cooling agent to be circulated through the brewbarrels is preferred not only because of its negligible cost but becauseit has no corrosive or other deleterious action on the conduits of thebarrels, and furthermore can be circulated under low pressure and soadmits of the use of thin-walled tubing of correspondingly light weightand low cost. It is understood, however, that the invention embraceswithin its scope, as defined in certain of the claims, the use of anyfluid cooling medium to be circulated through the brew barrel conduits,whether that medium be a brine or a vaporizable refrigerant andregardless by what means the heat be abstracted from the brine or otherrefrigerant after its has circulated through the barrels.

Iiaving thus described my invention, what I claim as new and desire tosecure by Letters Patent of the United States is:

1. A cooling system of the character described comprising a coolingliquid tank, refrigerating means therefor, control means to maintainsaid liquid at a temperature within predetermined limits, a plurality ofunits to be cooled,

each of said units having a cooling conduit associated therewith, anelectrically operated pump for circulating liquid from said tank inparallel through said several conduits, a thermostatically operatedswitch subjected to temperature in said tank and connected to interruptthe motor circuit should the cooling liquid become exces sively warm,thereby to preclude the circulation of warm water to the units, and anelectric trouble signal connected automatically to register when themotor circuit is interrupted, and a hand switch for disconnecting themotor circuit at will and simultaneously connecting the signal when aunit is to be replaced.

2. A cooling system for maintaining beverage in individual containers atdispensing temperature, said system comprising water conduits in heattransfer relation with the beverage in the individual containers, acooling liquid tank, a supply main leading therefrom, a return maindelivering thereto, the conduits of the individual containers beingconnected in parallel across said mains, an electrically driven pump forcirculating the supply water to effect the desired cooling of thebeverage, mechanical refrigerating equipment maintaining the water inthe reservoir between predetermined temperature limits, and athermostatic switch having a control element subject to temperature insaid tank, to automatically interrupt the motor circuit, thereby toprevent further circulation to the containers should the cooling waterreach a temperature in excess of the permissible maximum.

3. A cooling system for maintaining a beverage in individual containerssubstantially at dispensing temperature, said system comprising waterconduits in heat transfer relation with the beverage in the individualcontainers, a cooling water tank, a supply main leading therefrom, areturn main delivering thereto, the conduits of the individualcontainers being connected in parallel across said mains, anelectrically driven pump for circulating the cooling water to effect thedesired cooling, mechanical refrigerating equipment maintaining thewater in the tank between predetermined temperature limits, athermostatic switch having a control element subject to temperature insaid tank to automatically prevent further circulation of water fromsaid tank should the same reach a temperature in excess of thepermissible maximum, and a manual switch for interrupting thecirculating motor circuit at will, as for the replacement of an emptycontainer, said conduit system being constructed and arranged topreclude draining of water from the system when disconnecting acontainer therefrom.

4. A cooling system for maintaining beverage in individual containerssubstantially at dispensing temperature, said system comprising coldwater conduits in' heat transfer relation with the beverage in theindividual containers, a cooling liquid tank, a supply main. leadingtherefrom, a return main delivering thereto, the conduits of theindividual containers being connected in parallel across said mains, anelectrically driven pump for circulating cooling water to effect thedesired cooling. mechanical refrigerating equipment maintaining thewater in the reservoir between predetermined temperature limits, athermostatic switch having a control element subject to temperature insaid reservoir to automatically prevent further circulation of waterfrom said reservoir should the same reach a temperature in excess of thepermissible maximum, whereby the circulation of warm water through thebeverage conduits in the event of a defect therein is precluded, amanual switch for interrupting the motor circuit at will, as for thereplacement of an empty container, said cooling liquid tank having meanslimiting the water therein to a level below that of the connections tothe several containers, said mains having their tank ends substantiallybelow the branch ends of the respective containers, whereby uponinterrupting the cooling circuit connections to any container, coolingliquid will be siphoned back to the tank and will not be lost.

5. In an installation of the type which includes a plurality ofheat-insulating transportation containers, each of said containersequipped with a conduit therein in heat transfer relation to thecontained liquid, a cooling Water ta k, a supply main feeding from saidtank, a return main delivering to said tank, said several mains havingbranch connections releasably connecting the conduits of the severalcontainers in parallel and means for circulating water from said tankthrough the mains and the cooling conduits; the combination of thereleasable connections for the various conduits substantially above thetank ends of'the mains, and above the level of water in said tank.

6. In a circulating cooling system a cooling water tank, feed mainscommunicating therewith, a pump for circulating cooling water from said.tank through said mains, an electric motor for operating said pump,mechanical refrigerating equipment for chilling the tank water andincluding a refrigerant conduit and an electric compressor-drivingmotor, thermostatic control means for interrupting the compressor motorcircuit when a predetermined temperature of the refrigerant is reached,and. thermostatic control means subjected to temperature in the coolingwater tank for interrupting the circuit of the circulating pump motor,to discontinue water circulation, independently of the operation of themechanical refrigerator when the temperature of the cooling waterexceeds a predetermined value.

'7. A refrigerating cabinet having a cooling water tank, a controlcompartment along one wall of said tank, an electric motor, a pump shaftnear the bottom of said tank and driven from said motor, a pump on saidshaft and in said tank, having an output pipe extending to an outlet atthe top of said cabinet, a refrigerating coil in said tank, athermostatic bulb carried near the outlet thereof, an expansion valvegoverned by said thermostatic bulb, a second thermostatic bulb subjectedto temperature in said tank, a thermostatic switch governed thereby anddisposed in said control compartment, said switch controlling thecircuit of said motor to interrupt circulation of cooling water shouldthe temperature thereof become excessive.

8. A refrigerating cabinet comprising a heat insulated tank having arefrigerating coil therein, said cabinet having a control compartment infront of said tank, an electric motor under the floor of said tankbehind said control compartment, a pump in said tank having a shaftextending through one of the heat insulated walls into said controlcompartment, a drive belt connecting said motor to said protruding pumpshaft end, a water feed connection at the cover of said tank and aflexible hose connecting the outlet of said pump to said feedconnection.

9. A refrigerating cabinet having a heat insulated tank therein for thecooling fluid, a refrigerating coil submerged in said tank, aninsulating cover on said tank, a water pump submerged in said tank and awater header elbow unit mounted on said cover having means in cludingtwo ducts for connection respectively to a supply and to a returnheader, and a flexible hose connection within said tank between saidpump and one of the ducts of said header.

10. A refrigerating cabinet having an elevated floor, a heat insulatedtank thereon, a refrigerating coil within said tank, a controlcompartment in front of said tank, an electric motor below said fioor,'apump within said tank, a driving belt connection between said motor andsaid pump extending into said control compartment, 8. cover ledge onsaid tank, an expansion valve mounted thereon and having a bulbconnection through said cover ledge to said coil, a second bulb mountedon said coil, a temperature control valve in said control compartmentoperably connected to said second bulb and adapted to control theoperation of a compressor for supplying the coil with primaryrefrigerant, a third bulb on said coil, a combination thermostatic,overload and manual switch in said control compartment operativelyconnected to said third bulb, and an electric indicator in said controlcompartment connected to register when said latter valve is in openposition.

11. In a refrigerating cabinet, the combination of a heat insulated tankhaving a refrigerating coil therein, a heat insulated cover thereforcomprising a rear ledge, an expansion valve mounted thereon andconnected therethrough with respect to said coil, a header elbow memberon said ledge, a motor operated pump within said tank and a conduitconnecting said pump to said header.

12. A system for cooling the contents of individual containers, saidsystem including conduits in heat transfer relation with said contents,a tank of cooling liquid, feed mains communicating with said tank, theconduits of the respective individual containers being releasablyconnected in parallel across said feed mains, means for circulatingwater from said tank through said mains, and a flow resisting passageconnecting the outermost extremities of said mains and serving topreclude air-lock.

13. A system. for cooling the contents of individual containers, saidsystem including conduits in heat transfer relation with said contents,a tank of cooling liquid, a supply main and a return main bothcommunicating with said tank, the conduits of the respective individualcontainers being releasably connected in parallel across said mains,means for circulating water from said tank through said mains, the tankends of said mains and the water level in said tank extending below thereleasable connections to the containers, for exertion of a siphoningeffect upon disconnection of any container and accordingly to precludeloss of water from the cooling water mains, and a high resistance flowconduit establishing a connection free from interference with theconduits of the several containers, to aid in expelling air that mightotherwise become trapped in the circulating conduit.

14. In a circulating cooling system, a cooling water tank, feed meanscommunicating therewith, a pump for circulating cooling water from saidtank through said means, an electric motor for operating said pump,mechanical refrigerating equipment for chilling the tank water andincluding a refrigerant conduit in said tank and an electric compressordriving motor, thermostatic control means for interrupting thecompressor motor circuit when a predetermined temperature of therefrigerant is reached and a combination overload and manual switch forinterrupting the circuit of the circulating pump motor to discontinuewater circulation independently of the operation of the mechanicalrefrigerating, equipment.

15. In a circulating cooling system, a cooling water tank, feed meanscommunicating therewith, a pump for circulating cooling water from saidtank through said means, mechanical refrigerating equipment for chillingthe water and including a refrigerant coil in said tank, electric motormeans for operating the refrigerating equipment and for operating thepump, and a combination thermostatic, overload and manual switch forcontrolling the circuit of said electric motor means.

16. In a circulating cooling system a cooling water tank, feed mainscommunicating therewith, a pump for circulating cooling water from saidtank through said mains, an electric motor for operating said pump,mechanical refrigerating equipment for chilling the tank water andincluding a refrigerant coil in said tank and an electriccompressor-driving motor, thermostatic control means for interruptingthe compressor said tank through said mains, an electric motor foroperating said pump, mechanical refrigerating equipment for chilling thetank water and including a refrigerant coil in said tank and an electriccompressor-driving motor. thermostatic control means for interruptingthe compressor motor circuit when a predetermined temperature of therefrigerant is reached, and means for automatically interrupting thecircuit of the circulating pump motor to discontinue water circulationupon the occurrence of an abnormal condition.

18. A refrigerating cabinet having a heat insulated tank therein for thecooling fluid a refrigerating coil submerged in said tank, an insulatingcover on said tank, a water pump submerged in and near the bottom ofsaid tank, elbow connection means mounted on said cover, including twoducts for connection respectively to a supply and to a return header,and a conduit within said tank connectin said pump to one of said elbowducts.

HERMAN E. SCHULSE.

